SYNTAX

C Syntax

Fortran Syntax

C++ Syntax

#include <mpi.h>
void Comm::Free()

INPUT PARAMETER

comm Communicator to be destroyed (handle).

OUTPUT PARAMETER

IERROR Fortran only: Error status (integer).

DESCRIPTION

This operation marks the communicator object for deallocation. The han-
dle is set to MPI_COMM_NULL. Any pending operations that use this com-
municator will complete normally; the object is actually deallocated
only if there are no other active references to it. This call applies
to intracommunicators and intercommunicators. Upon actual deallocation,
the delete callback functions for all cached attributes (see Section
5.7 in the MPI-1 Standard, "Caching") are called in arbitrary order.

ERRORS

Almost all MPI routines return an error value; C routines as the value
of the function and Fortran routines in the last argument. C++ func-
tions do not return errors. If the default error handler is set to
MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism
will be used to throw an MPI:Exception object.
Before the error value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job, except for
I/O function errors. The error handler may be changed with
MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN
may be used to cause error values to be returned. Note that MPI does
not guarantee that an MPI program can continue past an error.
1.3.4 Nov 11, 2009 MPI_Comm_free(3)